One little thing. You can do this: (CORRECTED)
s/[\s\t]//g;
To replace instances from a set of characters, in this case whitespace or a tab. However, neither that nor what you have is actually necessary, as \s indicates any kind of whitespace, which with ascii means either a space or a tab. So just \s is fine.
The other thing is that is that what jwkrahn recommends:
$mailhouse{$f4} = [];
Is correct, but I would call it an anonymous array reference just to be completely clear (altho, of course, the only thing that can contain an anonymous array is a reference).
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